#include <iostream>
#include <vector>

using namespace std;

int main(){
    int n;
    float summ = 0,sr;
    cin >> n;
    vector<float> array(n);
    for (int i = 0; i < n; ++i) {
        cin >> array[i];
    }
    for(auto i = 0; i < n;i++){
        summ+=array[i];
    }
    sr=summ/n;
    cout<<sr;

}